It so for good reason that virtually every top professional engine builder
relies on ARP
PRO SERIES head for their all-out competition powerplants. Simply
stated, there's not a better stud setup on the market today. For openers, ARP
uses a premium grade 8740 alloy that is rated far superior to "aircraft"
quality. Then, each stud is placed vertically in special racks and precisely
heat-treated to 190,000 psi. this procedure ensures complete heat penetration
and the results are far superior to those lesser quality studs from other
manufacturers who just dump pieces in a basket and hope for the best. You will
also note that ARP offers specially undercut studs for several engines. This
procedure (done only to the shorter studs) more equalizes the "stretch" of both
studs, which makes for a more consistent clamping force-and one that compensates
for engine sealing! ARP head stud kits are available with your choice of
conventional hex nuts or compact 12-point nuts. Premium quality parallel ground
washers are also included with each kit. Clearly, they are the best on the
market today, and the favorite of leading professional engine builders in all
forms of racing
